Changing a job from dotnet or java to shell creates a wrong job configuration

Current Situation

When a job in JOE is changed from dotnet to shell, the attributes dotnet_class="" dll="" are still in the configuration.
When a job in JOE is changed from java to shell, the attribute java_options"" is still in the configuration.

Desired Behaviour

When a job in JOE is changed from dotnet to shell, the attributes dotnet_class="" dll="" should be removed.
The same is when changing from java to shell with the attribute jave_options="".